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Strivers A2Z DSA Course/Sheet

This course is made for people who want to learn DSA from A to Z for free in a well-organized and structured manner. The lecture quality is better than what you get in paid courses, the only thing we don’t provide is doubt support, but trust me our YouTube video comments resolve that as well, we have a wonderful community of 250K+ people who engage in all of the videos.

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Problem	Note	Difficulty
User Input / Output	Save Notes	Easy
Data Types	Save Notes	Easy
If Else statements	Save Notes	Easy
Switch Statement	Save Notes	Easy
What are arrays, strings?	Save Notes	Easy
For loops	Save Notes	Easy
While loops	Save Notes	Easy
Functions (Pass by Reference and Value)	Save Notes	Easy
Time Complexity [Learn Basics, and then analyse in next Steps]	Save Notes	Easy

Problem	Note	Difficulty
Count Digits	Save Notes	Easy
Reverse a Number	Save Notes	Easy
Check Palindrome	Save Notes	Easy
GCD Or HCF	Save Notes	Easy
Armstrong Numbers	Save Notes	Easy
Print all Divisors	Save Notes	Easy
Check for Prime	Save Notes	Easy

Problem	Note	Difficulty
Understand recursion by print something N times	Save Notes	Easy
Print name N times using recursion	Save Notes	Easy
Print 1 to N using recursion	Save Notes	Easy
Print N to 1 using recursion	Save Notes	Easy
Sum of first N numbers	Save Notes	Easy
Factorial of N numbers	Save Notes	Easy
Reverse an array	Save Notes	Easy
Check if a string is palindrome or not	Save Notes	Medium
Fibonacci Number	Save Notes	Easy

Problem	Youtube	Note	Difficulty
Hashing Theory		Save Notes	Medium
Counting frequencies of array elements	soon...	Save Notes	Easy
Find the highest/lowest frequency element	soon...	Save Notes	Easy

Problem	Youtube	Note	Difficulty
Merge Sort		Save Notes	Medium
Recursive Bubble Sort	soon...	Save Notes	Easy
Recursive Insertion Sort	soon...	Save Notes	Easy
Quick Sort		Save Notes	Easy

Problem	Note	Difficulty
Largest Element in an Array	Save Notes	Easy
Second Largest Element in an Array without sorting	Save Notes	Easy
Check if the array is sorted	Save Notes	Easy
Remove duplicates from Sorted array	Save Notes	Easy
Left Rotate an array by one place	Save Notes	Easy
Left rotate an array by D places	Save Notes	Easy
Move Zeros to end	Save Notes	Easy
Linear Search	Save Notes	Easy
Find the Union	Save Notes	Medium
Find missing number in an array	Save Notes	Easy
Maximum Consecutive Ones	Save Notes	Easy
Find the number that appears once, and other numbers twice.	Save Notes	Medium
Longest subarray with given sum K(positives)	Save Notes	Medium
Longest subarray with sum K (Positives + Negatives)	Save Notes	Medium

Problem	Note	Difficulty
2Sum Problem	Save Notes	Medium
Sort an array of 0's 1's and 2's	Save Notes	Medium
Majority Element (>n/2 times)	Save Notes	Easy
Kadane's Algorithm, maximum subarray sum	Save Notes	Easy
Print subarray with maximum subarray sum (extended version of above problem)	Save Notes	Medium
Stock Buy and Sell	Save Notes	Easy
Rearrange the array in alternating positive and negative items	Save Notes	Medium
Next Permutation	Save Notes	Medium
Leaders in an Array problem	Save Notes	Easy
Longest Consecutive Sequence in an Array	Save Notes	Medium
Set Matrix Zeros	Save Notes	Medium
Rotate Matrix by 90 degrees	Save Notes	Medium
Print the matrix in spiral manner	Save Notes	Medium
Count subarrays with given sum	Save Notes	Easy

Problem	Note	Difficulty
Pascal's Triangle	Save Notes	Medium
Majority Element (n/3 times)	Save Notes	Medium
3-Sum Problem	Save Notes	Medium
4-Sum Problem	Save Notes	Hard
Largest Subarray with 0 Sum	Save Notes	Medium
Count number of subarrays with given xor K	Save Notes	Hard
Merge Overlapping Subintervals	Save Notes	Medium
Merge two sorted arrays without extra space	Save Notes	Medium
Find the repeating and missing number	Save Notes	Hard
Count Inversions	Save Notes	Hard
Reverse Pairs	Save Notes	Hard
Maximum Product Subarray	Save Notes	Easy

Problem	Note	Difficulty
Binary Search to find X in sorted array	Save Notes	Easy
Implement Lower Bound	Save Notes	Easy
Implement Upper Bound	Save Notes	Easy
Search Insert Position	Save Notes	Easy
Floor/Ceil in Sorted Array	Save Notes	Medium
Find the first or last occurrence of a given number in a sorted array	Save Notes	Easy
Count occurrences of a number in a sorted array with duplicates	Save Notes	Easy
Search in Rotated Sorted Array I	Save Notes	Medium
Search in Rotated Sorted Array II	Save Notes	Medium
Find minimum in Rotated Sorted Array	Save Notes	Medium
Find out how many times has an array been rotated	Save Notes	Easy
Single element in a Sorted Array	Save Notes	Easy
Find peak element	Save Notes	Hard

Problem	Note	Difficulty
Find square root of a number in log n	Save Notes	Medium
Find the Nth root of a number using binary search	Save Notes	Medium
Koko Eating Bananas	Save Notes	Hard
Minimum days to make M bouquets	Save Notes	Hard
Find the smallest Divisor	Save Notes	Easy
Capacity to Ship Packages within D Days	Save Notes	Hard
Kth Missing Positive Number	Save Notes	Easy
Aggressive Cows	Save Notes	Hard
Book Allocation Problem	Save Notes	Hard
Split array - Largest Sum	Save Notes	Hard
Painter's partition	Save Notes	Hard
Minimize Max Distance to Gas Station	Save Notes	Hard
Median of 2 sorted arrays	Save Notes	Hard
Kth element of 2 sorted arrays	Save Notes	Medium

Problem	Note	Difficulty
Find the row with maximum number of 1's	Save Notes	Easy
Search in a 2 D matrix	Save Notes	Medium
Search in a row and column wise sorted matrix	Save Notes	Medium
Find Peak Element (2D Matrix)	Save Notes	Hard
Matrix Median	Save Notes	Hard

Problem	Youtube	Note	Difficulty
Remove outermost Paranthesis	soon...	Save Notes	Easy
Reverse words in a given string / Palindrome Check	soon...	Save Notes	Easy
Largest odd number in a string	soon...	Save Notes	Easy
Longest Common Prefix	soon...	Save Notes	Easy
Isomorphic String	soon...	Save Notes	Easy
check whether one string is a rotation of another	soon...	Save Notes	Medium
Check if two strings are anagram of each other	soon...	Save Notes	Medium

Problem	Youtube	Note	Difficulty
Sort Characters by frequency	soon...	Save Notes	Easy
Maximum Nesting Depth of Paranthesis	soon...	Save Notes	Easy
Roman Number to Integer and vice versa	soon...	Save Notes	Easy
Implement Atoi	soon...	Save Notes	Medium
Count Number of Substrings	soon...	Save Notes	Medium
Longest Palindromic Substring[Do it without DP]	soon...	Save Notes	Hard
Sum of Beauty of all substring	soon...	Save Notes	Medium
Reverse Every Word in A String	soon...	Save Notes	Easy

Problem	Note	Difficulty
Introduction to LinkedList, learn about struct, and how is node represented	Save Notes	Easy
Inserting a node in LinkedList	Save Notes	Easy
Deleting a node in LinkedList	Save Notes	Medium
Find the length of the linkedlist [learn traversal]	Save Notes	Easy
Search an element in the LL	Save Notes	Easy

Problem	Note	Difficulty
Introduction to DLL, learn about struct, and how is node represented	Save Notes	Easy
Insert a node in DLL	Save Notes	Easy
Delete a node in DLL	Save Notes	Medium
Reverse a DLL	Save Notes	Medium

Problem	Note	Difficulty
Middle of a LinkedList [TortoiseHare Method]	Save Notes	Easy
Reverse a LinkedList [Iterative]	Save Notes	Easy
Reverse a LL [Recursive]	Save Notes	Easy
Detect a loop in LL	Save Notes	Medium
Find the starting point in LL	Save Notes	Medium
Length of Loop in LL	Save Notes	Easy
Check if LL is palindrome or not	Save Notes	Medium
Segrregate odd and even nodes in LL	Save Notes	Medium
Remove Nth node from the back of the LL	Save Notes	Medium
Delete the middle node of LL	Save Notes	Medium
Sort LL	Save Notes	Medium
Sort a LL of 0's 1's and 2's by changing links	Save Notes	Medium
Find the intersection point of Y LL	Save Notes	Medium
Add 1 to a number represented by LL	Save Notes	Medium
Add 2 numbers in LL	Save Notes	Medium

Problem	Note	Difficulty
Delete all occurrences of a key in DLL	Save Notes	Medium
Find pairs with given sum in DLL	Save Notes	Medium
Remove duplicates from sorted DLL	Save Notes	Medium

Problem	Note	Difficulty
Reverse LL in group of given size K	Save Notes	Hard
Rotate a LL	Save Notes	Medium
Flattening of LL	Save Notes	Hard
Clone a Linked List with random and next pointer	Save Notes	Hard

Problem	Youtube	Note	Difficulty
Recursive Implementation of atoi()	soon...	Save Notes	Hard
Pow(x, n)		Save Notes	Medium
Count Good numbers	soon...	Save Notes	Easy
Sort a stack using recursion	soon...	Save Notes	Medium
Reverse a stack using recursion	soon...	Save Notes	Easy

Problem	Youtube	Note	Difficulty
Generate all binary strings	soon...	Save Notes	Medium
Generate Paranthesis	soon...	Save Notes	Medium
Print all subsequences/Power Set		Save Notes	Medium
Learn All Patterns of Subsequences (Theory)		Save Notes	Medium
Count all subsequences with sum K	soon...	Save Notes	Hard
Check if there exists a subsequence with sum K	soon...	Save Notes	Medium
Combination Sum		Save Notes	Medium
Combination Sum-II		Save Notes	Medium
Subset Sum-I		Save Notes	Medium
Subset Sum-II		Save Notes	Medium
Combination Sum - III	soon...	Save Notes	Hard
Letter Combinations of a Phone number	soon...	Save Notes	Medium

Problem	Youtube	Note	Difficulty
Palindrome Partitioning		Save Notes	Medium
Word Search	soon...	Save Notes	Medium
N Queen		Save Notes	Hard
Rat in a Maze		Save Notes	Hard
Word Break	soon...	Save Notes
M Coloring Problem		Save Notes	Hard
Sudoko Solver		Save Notes	Hard
Expression Add Operators	soon...	Save Notes	Hard

Problem	Note	Difficulty
Introduction to Bit Manipulation [Theory]	Save Notes	Easy
Check if the i-th bit is set or not	Save Notes	Easy
Check if a number is odd or not	Save Notes	Easy
Check if a number is power of 2 or not	Save Notes	Easy
Count the number of set bits	Save Notes	Easy
Set/Unset the rightmost unset bit	Save Notes	Easy
Swap two numbers	Save Notes	Easy
Divide two integers without using multiplication, division and mod operator	Save Notes	Medium

Problem	Note	Difficulty
Count number of bits to be flipped to convert A to B	Save Notes	Medium
Find the number that appears odd number of times	Save Notes	Easy
Power Set	Save Notes	Medium
Find xor of numbers from L to R	Save Notes	Easy
Find the two numbers appearing odd number of times	Save Notes	Easy

Problem	Note	Difficulty
Print Prime Factors of a Number	Save Notes	Easy
All Divisors of a Number	Save Notes	Easy
Sieve of Eratosthenes	Save Notes	Medium
Find Prime Factorisation of a Number using Sieve	Save Notes	Medium
Power(n, x)	Save Notes	Medium

Problem	Youtube	Note	Difficulty
Implement Stack using Arrays		Save Notes	Easy
Implement Queue using Arrays		Save Notes	Easy
Implement Stack using Queue		Save Notes	Medium
Implement Queue using Stack		Save Notes	Medium
Implement stack using Linkedlist	soon...	Save Notes
Implement queue using Linkedlist	soon...	Save Notes	Medium
Check for balanced paranthesis		Save Notes	Medium
Implement Min Stack		Save Notes	Medium

Problem	Youtube	Note	Difficulty
Infix to Postfix Conversion using Stack	soon...	Save Notes	Medium
Prefix to Infix Conversion	soon...	Save Notes	Medium
Prefix to Postfix Conversion	soon...	Save Notes	Medium
Postfix to Prefix Conversion	soon...	Save Notes	Medium
Postfix to Infix	soon...	Save Notes	Medium
Convert Infix To Prefix Notation	soon...	Save Notes	Medium

Problem	Youtube	Note	Difficulty
Next Greater Element		Save Notes	Easy
Next Greater Element 2	soon...	Save Notes	Medium
Next Smaller Element	soon...	Save Notes	Easy
Number of NGEs to the right	soon...	Save Notes	Easy
Trapping Rainwater		Save Notes	Hard
Sum of subarray minimum	soon...	Save Notes	Medium
Asteroid Collision	soon...	Save Notes	Medium
Sum of subarray ranges	soon...	Save Notes	Medium
Remove k Digits	soon...	Save Notes	Medium
Largest rectangle in a histogram		Save Notes	Medium
Maximal Rectangles	soon...	Save Notes	Hard

Problem	Youtube	Note	Difficulty
Sliding Window maximum		Save Notes	Hard
Stock span problem	soon...	Save Notes	Medium
The Celebrity Problem	soon...	Save Notes	Hard
LRU cache (IMPORTANT)		Save Notes	Hard
LFU cache		Save Notes	Hard

Problem	Note	Difficulty
Longest Substring Without Repeating Characters	Save Notes	Medium
Max Consecutive Ones III	Save Notes	Medium
Fruit Into Baskets	Save Notes	Medium
longest repeating character replacement	Save Notes	Medium
Binary subarray with sum	Save Notes	Easy
Count number of nice subarrays	Save Notes	Medium
Number of substring containing all three characters	Save Notes	Medium
Maximum point you can obtain from cards	Save Notes	Medium

Problem	Youtube	Note	Difficulty
Longest Substring with At Most K Distinct Characters		Save Notes	Medium
Subarray with k different integers		Save Notes	Hard
Minimum Window Substring		Save Notes	Hard
Minimum Window Subsequence	soon...	Save Notes	Hard

Problem	Youtube	Note	Difficulty
Introduction to Priority Queues using Binary Heaps	soon...	Save Notes	Medium
Min Heap and Max Heap Implementation	soon...	Save Notes	Medium
Check if an array represents a min-heap or not	soon...	Save Notes	Medium
Convert min Heap to max Heap	soon...	Save Notes	Medium

Problem	Youtube	Note	Difficulty
Kth largest element in an array [use priority queue]	soon...	Save Notes	Easy
Kth smallest element in an array [use priority queue]	soon...	Save Notes	Easy
Sort K sorted array	soon...	Save Notes	Easy
Merge M sorted Lists	soon...	Save Notes	Hard
Replace each array element by its corresponding rank	soon...	Save Notes	Easy
Task Scheduler	soon...	Save Notes	Medium
Hands of Straights	soon...	Save Notes	Medium

Problem	Youtube	Note	Difficulty
Design twitter	soon...	Save Notes	Medium
Connect `n` ropes with minimal cost	soon...	Save Notes	Medium
Kth largest element in a stream of running integers	soon...	Save Notes	Easy
Maximum Sum Combination	soon...	Save Notes	Medium
Find Median from Data Stream	soon...	Save Notes	Hard
K most frequent elements	soon...	Save Notes	Medium

Problem	Youtube	Note	Difficulty
Assign Cookies	soon...	Save Notes	Easy
Fractional Knapsack Problem		Save Notes	Medium
Greedy algorithm to find minimum number of coins		Save Notes	Medium
Lemonade Change	soon...	Save Notes	Easy
Valid Paranthesis Checker	soon...	Save Notes	Medium

Problem	Youtube	Note	Difficulty
N meetings in one room		Save Notes	Medium
Jump Game	soon...	Save Notes	Medium
Jump Game 2	soon...	Save Notes	Medium
Minimum number of platforms required for a railway		Save Notes	Medium
Job sequencing Problem		Save Notes	Medium
Candy	soon...	Save Notes	Hard
Program for Shortest Job First (or SJF) CPU Scheduling	soon...	Save Notes	Medium
Program for Least Recently Used (LRU) Page Replacement Algorithm	soon...	Save Notes	Medium
Insert Interval	soon...	Save Notes	Medium
Merge Intervals		Save Notes	Medium
Non-overlapping Intervals	soon...	Save Notes	Medium

Problem	Note	Difficulty
Introduction to Trees	Save Notes	Easy
Binary Tree Representation in C++	Save Notes	Easy
Binary Tree Representation in Java	Save Notes	Easy
Binary Tree Traversals in Binary Tree	Save Notes	Easy
Preorder Traversal of Binary Tree	Save Notes	Easy
Inorder Traversal of Binary Tree	Save Notes	Easy
Post-order Traversal of Binary Tree	Save Notes	Easy
Level order Traversal / Level order traversal in spiral form	Save Notes	Easy
Iterative Preorder Traversal of Binary Tree	Save Notes	Easy
Iterative Inorder Traversal of Binary Tree	Save Notes	Easy
Post-order Traversal of Binary Tree using 2 stack	Save Notes	Easy
Post-order Traversal of Binary Tree using 1 stack	Save Notes	Medium
Preorder, Inorder, and Postorder Traversal in one Traversal	Save Notes	Medium

Problem	Note	Difficulty
Height of a Binary Tree	Save Notes	Medium
Check if the Binary tree is height-balanced or not	Save Notes	Medium
Diameter of Binary Tree	Save Notes	Medium
Maximum path sum	Save Notes	Hard
Check if two trees are identical or not	Save Notes	Medium
Zig Zag Traversal of Binary Tree	Save Notes	Easy
Boundary Traversal of Binary Tree	Save Notes	Medium
Vertical Order Traversal of Binary Tree	Save Notes	Easy
Top View of Binary Tree	Save Notes	Easy
Bottom View of Binary Tree	Save Notes	Medium
Right/Left View of Binary Tree	Save Notes	Medium
Symmetric Binary Tree	Save Notes	Medium

Problem	Note	Difficulty
Root to Node Path in Binary Tree	Save Notes	Medium
LCA in Binary Tree	Save Notes	Medium
Maximum width of a Binary Tree	Save Notes	Medium
Check for Children Sum Property	Save Notes	Hard
Print all the Nodes at a distance of K in a Binary Tree	Save Notes	Medium
Minimum time taken to BURN the Binary Tree from a Node	Save Notes	Hard
Count total Nodes in a COMPLETE Binary Tree	Save Notes	Medium
Requirements needed to construct a Unique Binary Tree \| Theory	Save Notes	Medium
Construct Binary Tree from inorder and preorder	Save Notes	Hard
Construct the Binary Tree from Postorder and Inorder Traversal	Save Notes	Hard
Serialize and deserialize Binary Tree	Save Notes	Hard
Morris Preorder Traversal of a Binary Tree	Save Notes	Medium
Morris Inorder Traversal of a Binary Tree	Save Notes	Medium
Flatten Binary Tree to LinkedList	Save Notes	Hard

Problem	Youtube	Note	Difficulty
Introduction to Binary Search Tree		Save Notes	Easy
Search in a Binary Search Tree		Save Notes	Easy
Find Min/Max in BST	soon...	Save Notes	Medium

Problem	Note	Difficulty
Ceil in a Binary Search Tree	Save Notes	Easy
Floor in a Binary Search Tree	Save Notes	Easy
Insert a given Node in Binary Search Tree	Save Notes	Easy
Delete a Node in Binary Search Tree	Save Notes	Medium
Find K-th smallest/largest element in BST	Save Notes	Medium
Check if a tree is a BST or BT	Save Notes	Medium
LCA in Binary Search Tree	Save Notes	Medium
Construct a BST from a preorder traversal	Save Notes	Medium
Inorder Successor/Predecessor in BST	Save Notes	Medium
Merge 2 BST's	Save Notes	Hard
Two Sum In BST \| Check if there exists a pair with Sum K	Save Notes	Medium
Recover BST \| Correct BST with two nodes swapped	Save Notes	Hard
Largest BST in Binary Tree	Save Notes	Hard

Problem	Note	Difficulty
Graph and Types	Save Notes	Easy
Graph Representation \| C++	Save Notes	Easy
Graph Representation \| Java	Save Notes	Easy
Connected Components \| Logic Explanation	Save Notes	Hard
BFS	Save Notes	Medium
DFS	Save Notes	Hard

Problem	Youtube	Note	Difficulty
Number of provinces (leetcode)		Save Notes	Medium
Connected Components Problem in Matrix	soon...	Save Notes	Hard
Rotten Oranges		Save Notes	Medium
Flood fill		Save Notes	Hard
Cycle Detection in unirected Graph (bfs)		Save Notes	Hard
Cycle Detection in undirected Graph (dfs)		Save Notes	Hard
0/1 Matrix (Bfs Problem)		Save Notes	Medium
Surrounded Regions (dfs)		Save Notes	Hard
Number of Enclaves [flood fill implementation - multisource]		Save Notes	Hard
Word ladder - 1		Save Notes	Hard
Word ladder - 2		Save Notes	Hard
Number of Distinct Islands [dfs multisource]		Save Notes	Hard
Bipartite Graph (DFS)		Save Notes	Medium
Cycle Detection in Directed Graph (DFS)		Save Notes	Hard

Problem	Note	Difficulty
Topo Sort	Save Notes	Hard
Kahn's Algorithm	Save Notes	Hard
Cycle Detection in Directed Graph (BFS)	Save Notes	Hard
Course Schedule - I	Save Notes	Hard
Course Schedule - II	Save Notes	Hard
Find eventual safe states	Save Notes	Hard
Alien dictionary	Save Notes	Hard

Problem	Youtube	Note	Difficulty
Shortest Path in UG with unit weights		Save Notes	Hard
Shortest Path in DAG		Save Notes	Hard
Djisktra's Algorithm		Save Notes	Hard
Why priority Queue is used in Djisktra's Algorithm		Save Notes	Medium
Shortest path in a binary maze		Save Notes	Medium
Path with minimum effort		Save Notes	Medium
Cheapest flights within k stops		Save Notes	Hard
Network Delay time	soon...	Save Notes	Medium
Number of ways to arrive at destination		Save Notes	Medium
Minimum steps to reach end from start by performing multiplication and mod operations with array elements		Save Notes	Hard
Bellman Ford Algorithm		Save Notes	Hard
Floyd Warshal Algorithm		Save Notes	Hard
Find the city with the smallest number of neighbors in a threshold distance		Save Notes	Hard

Problem	Youtube	Note	Difficulty
Minimum Spanning Tree		Save Notes	Hard
Prim's Algorithm		Save Notes	Hard
Disjoint Set [Union by Rank]		Save Notes	Hard
Disjoint Set [Union by Size]		Save Notes	Hard
Kruskal's Algorithm		Save Notes	Hard
Number of operations to make network connected		Save Notes	Medium
Most stones removed with same rows or columns		Save Notes	Medium
Accounts merge		Save Notes	Hard
Number of island II		Save Notes	Hard
Making a Large Island		Save Notes	Hard
Swim in rising water	soon...	Save Notes	Hard

Problem	Note	Difficulty
Climbing Stars	Save Notes	Medium
Frog Jump(DP-3)	Save Notes	Medium
Frog Jump with k distances(DP-4)	Save Notes	Medium
Maximum sum of non-adjacent elements (DP 5)	Save Notes	Medium
House Robber (DP 6)	Save Notes	Medium

Problem	Note	Difficulty
Ninja's Training (DP 7)	Save Notes	Medium
Grid Unique Paths : DP on Grids (DP8)	Save Notes	Medium
Grid Unique Paths 2 (DP 9)	Save Notes	Medium
Minimum path sum in Grid (DP 10)	Save Notes	Medium
Minimum path sum in Triangular Grid (DP 11)	Save Notes	Medium
Minimum/Maximum Falling Path Sum (DP-12)	Save Notes	Medium
3-d DP : Ninja and his friends (DP-13)	Save Notes	Medium

Problem	Note	Difficulty
Subset sum equal to target (DP- 14)	Save Notes	Medium
Partition Equal Subset Sum (DP- 15)	Save Notes	Medium
Partition Set Into 2 Subsets With Min Absolute Sum Diff (DP- 16)	Save Notes	Medium
Count Subsets with Sum K (DP - 17)	Save Notes	Medium
Count Partitions with Given Difference (DP - 18)	Save Notes	Medium
0/1 Knapsack (DP - 19)	Save Notes	Hard
Minimum Coins (DP - 20)	Save Notes	Hard
Target Sum (DP - 21)	Save Notes	Medium
Coin Change 2 (DP - 22)	Save Notes	Hard
Unbounded Knapsack (DP - 23)	Save Notes	Hard
Rod Cutting Problem \| (DP - 24)	Save Notes	Hard

Problem	Note	Difficulty
Longest Common Subsequence \| (DP - 25)	Save Notes	Hard
Print Longest Common Subsequence \| (DP - 26)	Save Notes	Hard
Longest Common Substring \| (DP - 27)	Save Notes	Hard
Longest Palindromic Subsequence \| (DP-28)	Save Notes	Hard
Minimum insertions to make string palindrome \| DP-29	Save Notes	Hard
Minimum Insertions/Deletions to Convert String \| (DP- 30)	Save Notes	Hard
Shortest Common Supersequence \| (DP - 31)	Save Notes	Hard
Distinct Subsequences\| (DP-32)	Save Notes	Hard
Edit Distance \| (DP-33)	Save Notes	Hard
Wildcard Matching \| (DP-34)	Save Notes	Medium

Problem	Note	Difficulty
Best Time to Buy and Sell Stock \|(DP-35)	Save Notes	Hard
Buy and Sell Stock - II\|(DP-36)	Save Notes	Hard
Buy and Sell Stocks III\|(DP-37)	Save Notes	Hard
Buy and Stock Sell IV \|(DP-38)	Save Notes	Hard
Buy and Sell Stocks With Cooldown\|(DP-39)	Save Notes	Hard
Buy and Sell Stocks With Transaction Fee\|(DP-40)	Save Notes	Hard

Problem	Note	Difficulty
Longest Increasing Subsequence \|(DP-41)	Save Notes	Hard
Printing Longest Increasing Subsequence\|(DP-42)	Save Notes	Hard
Longest Increasing Subsequence \|(DP-43)	Save Notes	Hard
Largest Divisible Subset\|(DP-44)	Save Notes	Hard
Longest String Chain\|(DP-45)	Save Notes	Hard
Longest Bitonic Subsequence \|(DP-46)	Save Notes	Hard
Number of Longest Increasing Subsequences\|(DP-47)	Save Notes	Hard

Problem	Note	Difficulty
Matrix Chain Multiplication\|(DP-48)	Save Notes	Hard
Matrix Chain Multiplication \| Bottom-Up\|(DP-49)	Save Notes	Hard
Minimum Cost to Cut the Stick\|(DP-50)	Save Notes	Hard
Burst Balloons\|(DP-51)	Save Notes	Hard
Evaluate Boolean Expression to True\|(DP-52)	Save Notes	Hard
Palindrome Partitioning - II\|(DP-53)	Save Notes	Hard
Partition Array for Maximum Sum\|(DP-54)	Save Notes	Hard

Problem	Youtube	Note	Difficulty
Implement Trie - 2 (Prefix Tree)	soon...	Save Notes	Hard
Longest String with All Prefixes		Save Notes	Medium
Number of Distinct Substrings in a String		Save Notes	Hard
Bit PreRequisites for TRIE Problems		Save Notes	Hard
Maximum XOR of two numbers in an array		Save Notes	Medium
Maximum XOR With an Element From Array		Save Notes	Hard

Problem	Youtube	Note	Difficulty
Minimum number of bracket reversals needed to make an expression balanced	soon...	Save Notes	Medium
Count and say	soon...	Save Notes	Medium
Hashing In Strings \| Theory	soon...	Save Notes	Medium
Rabin Karp	soon...	Save Notes	Hard
Z-Function	soon...	Save Notes	Easy
KMP algo / LPS(pi) array	soon...	Save Notes	Hard
Shortest Palindrome	soon...	Save Notes	Hard
Longest happy prefix	soon...	Save Notes	Hard
Count palindromic subsequence in given string	soon...	Save Notes	Hard

Status	Problem	Article	Youtube	Practice	Note	Difficulty	Revision
	C++ STL				Save Notes	Medium
	Java Collections		soon...		Save Notes	Easy

Problem	Note	Difficulty
Selection Sort	Save Notes	Easy
Bubble Sort	Save Notes	Easy
Insertion Sort	Save Notes	Easy

Problem	Note	Difficulty
Bridges in Graph	Save Notes	Hard
Articulation Point	Save Notes	Hard
Kosaraju's Algorithm	Save Notes	Hard

Status	Problem	Article	Youtube	Practice	Note	Difficulty	Revision
	Maximum Rectangle Area with all 1's\|(DP-55)				Save Notes	Hard
	Count Square Submatrices with All Ones\|(DP-56)				Save Notes	Hard